The entire header was getting set as clickable because of old code
which would eat the clicks of the brightness slider (and other things)
when expanded.
Fixes: 35628944
Test: Trigger expandable update (like clear user_setup and set it)
then click on brightness in QS
Change-Id: I2d23aabf6b8a5b05f3b2b93ee723ec145514ce5e
1fdde2da76